Comments on: Friday the 13th https://blogs.mathworks.com/cleve/2012/07/09/friday-the-13th/?s_tid=feedtopost Cleve Moler is the author of the first MATLAB, one of the founders of MathWorks, and is currently Chief Mathematician at the company. He writes here about MATLAB, scientific computing and interesting mathematics. Thu, 02 May 2013 15:05:15 +0000 hourly 1 https://wordpress.org/?v=6.2.2 By: Cleve Moler https://blogs.mathworks.com/cleve/2012/07/09/friday-the-13th/#comment-20 Fri, 13 Jul 2012 17:33:14 +0000 https://blogs.mathworks.com/cleve/?p=182#comment-20 In reply to Bjorn.

They didn’t have MATLAB to anticipate the consequences of their actions …

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By: Cleve Moler https://blogs.mathworks.com/cleve/2012/07/09/friday-the-13th/#comment-19 Fri, 13 Jul 2012 17:30:02 +0000 https://blogs.mathworks.com/cleve/?p=182#comment-19 In reply to CM.

Actually, the Gregorian calendar was just proposed in 1582. It was gradually adopted by various countries and churches over the next four centuries. The British Empire, including the colonies in North America, did not adopt until 1752. Turkey adopted it in1923. But all that is just being picky.

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By: CM https://blogs.mathworks.com/cleve/2012/07/09/friday-the-13th/#comment-18 Fri, 13 Jul 2012 14:56:09 +0000 https://blogs.mathworks.com/cleve/?p=182#comment-18 My brother pointed out that the Gregorian calendar was adopted in 1582, so it *was* in effect in 1601.

http://en.wikipedia.org/wiki/Gregorian_calendar#Adoption

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By: Bjorn https://blogs.mathworks.com/cleve/2012/07/09/friday-the-13th/#comment-17 Fri, 13 Jul 2012 10:55:26 +0000 https://blogs.mathworks.com/cleve/?p=182#comment-17 What were they thinking of! When decisions with such wide-ranging consequences are made one have to take these things into account! If they’d squeezed in an extra holiday before switching to the Gregorian calender we’d have 4 Friday the 13th less per 400 years.

But they didn’t, and look now were we end up: Friday the 13th…

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